Question: What is a sovereign state for office held by the pope's head of state?
Paraphrase: What could be a autonomous state for office held by the pope's head of state?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P1906 wd:Q19546 . ?sbj wdt:P31 wd:Q3624078 } 
Answer: Vatican City